They are a part of a group of five kids from alimentary school camp out on the lake. Which of these is the most likely causative organism of this illness?

Three boys are brought to the urgent care clinic complaining of fever, sore throat and itchy eyes. On examination, their temperature range from 101.2 F to 102.7 F. Their conjunctivas are red and inflamed. They are a part of a group of five kids from alimentary school camp out on the lake.
Which of these is the most likely causative organism of this illness?

A-Adenovirus
B-Coxsackie virus
C-Echovirus
D-Measles
E-Rubella